Control Board for Antminer S21 Pro, S21 XP and S21+: Replacement Motherboard

Description

The Bitmain A113D (CB1) control board is a replacement motherboard dedicated to the Antminer S21 Pro, S21 XP and S21+ (SHA256, air-cooled).

It restores the operation of a machine showing a start-up fault, no network detection, a communication error with the hashboards or a system freeze caused by a faulty control board.

This version is exclusively for S21 Pro / S21+ / S21 XP models that use the large control board format.

A113D (CB1) control board specifications

Product information

This Antminer S21 Pro / S21 XP / S21+ control board fixes faults such as: no network detection, hashboards not recognised, unexpected reboots or a miner that will not start.

The official Bitmain firmware comes preinstalled. You can install custom firmware to improve stability and automatically optimise the miner’s thermal management.

Best practices

Installation must be carried out with the power off, by an experienced user or with guidance. If you have any doubts about the diagnosis or the replacement procedure, contact us before ordering.

Note: any firmware modification must be carried out by a qualified user.